Privacy is not a setting you enable at the end of a transaction. It is the accumulated result of how coins entered your wallet, how they were stored and how they were later combined. A coin purchased with a verified account carries that context with it for as long as it exists.
Start with the entry point. Coins acquired through an identity-checked platform are permanently associated with your verified profile in that platform's records. Peer-to-peer purchases, earned income and cash-based methods create a different starting context, and local rules on each of these differ, so check what applies where you live before choosing a method.
Storage discipline matters just as much. Use a fresh receiving address for each incoming payment; reusing one address turns it into a public balance sheet that anyone can follow. Keep coins from different sources in separate wallets or accounts, because spending them together in one transaction tells observers that both belong to you.
Coin control is the practical tool for this. A wallet that lets you choose which inputs to spend prevents accidental merging of unrelated histories. Pay attention to change as well: a payment that returns change into the same cluster reconnects funds you intended to keep apart.
Finally, be deliberate about what you publish. A single donation address in a forum signature, a screenshot with a visible address, or an invoice sent by email can anchor an entire cluster to your name. Mixing can break an on-chain trail, but it cannot retract information you have already shared in public.